I'm currently making a new VS for Windows 8 called Metro+. The idea of this theme is to combine the Aero and Metro UI together in a way that is simple, but not too simple. Take a look for yourself:One of the first thing you'll probably notice is that the window is transparent, however there is no blur. (The image is an animated PNG image, use a browser that supports APNG to see a better preview)

Not sure if it would end up as a total confusing mess with the transparency, yet no blur when loads of windows are open, it does look nice though. I'd personally make the borders a little softer, soften the shadow and kill the reflection though.